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Two coherent sources of intensity ratio $$\alpha$$ interfere. The value of $$\frac{I_{max} - I_{min}}{I_{max} + I_{min}}$$ is:
$$\sqrt[2]{\frac{\alpha}{1 + \alpha}}$$
$$\frac{2 \sqrt{\alpha}}{1 + \alpha}$$
$$\frac{1 + \alpha}{2 \sqrt{\alpha}}$$
$$\frac{1 - \alpha}{1 + \alpha}$$
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